Screw with a convenient screw head
A screw has a convenient head, wherein an engaging concavity is defined. Said engaging concavity includes a central portion and a plurality of radial recesses disposed around and in communication with the central portion. Each radial recess has two insides with one inside parallels to the extension line and the other inside encloses an angle with the extension line, an end surface and an opening with a smaller width defined on the junction of the recesses and the centre portion.
1. Field of the Invention
The present invention relates to a screw with a screw head wherein an engaging concavity is defined, in particularly to accommodate different screw bits.
2. Description of the Related Art
A conventional screw is disclosed by U.S. Pat. No. 2,402,342 in
Refer to U.S. Pat. No. 2,445,978 in
Refer to U.S. Pat. No. 5,364,212 in
The present invention intends to provide a screw head wherein a plurality of radial recesses is defined, each recesses includes two insides without paralleling to each other so as to receive the screw bits with different shapes and sizes
SUMMARY OF THE INVENTIONThe present invention relates to a screw with an engaging concavity defined in a top of the head. Said engaging concavity includes a central portion and a plurality of radial recesses located around and in communication with the central portion. Each radial recess includes two insides with one inside parallels to an extension line and the other inside encloses an angle with extension line, an end surface connected between the two insides and an opening with a width smaller than said end surface.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention.
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To sum up with above description, the present invention provides the following advantages:
1. Various Screw Bits Accommodation
Due to the number of radial recesses, the engaging concavity on the head is able to accommodate Phillip, slotted, Torx and pozi screw bits.
2. Prevent the Screw Bit from Slipping
By closely contacting the recess inside which is paralleled to the extension line, the screw bit is hard to slip from the engaging concavity.
While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
Claims
1. A screw comprising:
- a head and a shank with threads, said head having an engaging concavity defined therein including a central portion and a plurality of radial recesses located around and in communication with the central portion; said recesses extending respectively outward along extension line references defined diametrically through a center of the engaging concavity and an opposed pair of said radial recesses; each radial recess including two inside surface portions disposed asymmetrically about the extension line reference thereof, with one inside surface portion extending in parallel to the extension line reference and the other inside surface portion being angled outward relative to the extension line reference, an end surface portion extending between the two inside surface portions, whereby an opening defined by adjacent recesses at the central portion has width smaller than said end surface portion.
2. The screw as claim in claim 1, wherein a separation protrusion with a rounded distal surface portion is located between each adjacent pair of radial recesses.
3. The screw as claimed in claim 1 or 2, wherein the surface portions of the radial recesses are inclined to a central axis of the shank.
4. The screw as claimed in claim 2, wherein the surface portion of each separation protrusion is inclined to a central axis of the shank.
5. The screw as claimed in claim 1, wherein each said recess end surface portion is inclined to a central axis of the shank.
Type: Grant
Filed: Nov 14, 2005
Date of Patent: Jan 8, 2008
Patent Publication Number: 20070110545
Inventor: Ling-Fang Chen (Gangshan Township, Kaohsiung County 820)
Primary Examiner: Flemming Saether
Attorney: Rosenberg, Klein & Lee
Application Number: 11/271,758
International Classification: F16B 23/00 (20060101);